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Guianan Highlands Moist Forest
The Guayanan Highlands moist forests (NT0124) is an ecoregion in the south of Venezuela and the north of Brazil and in Guyana, Suriname, French Guiana. It is in the Amazon biome. It encompasses an upland region with diverse fauna and flora, which contains dramatic tepuis, or sandstone table mountains. The region has been inaccessible in the past and is generally fairly intact, apart from the north and northeast where large scale agriculture, ranching and mining operations are steadily encroaching on the ecosystem. New roads are opening the interior to logging, and planned dams will have a drastic impact on the riparian zones. Location The ecoregion includes parts of southern Venezuela, western and southern Guyana and northern Brazil, with scattered portions in Suriname and French Guiana. It extends into eastern Colombia. It has a total area of . The ecoregion lies on the Guiana Shield, an ancient upland area between the Amazon and Orinoco basins. It is surrounded by lowland grass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ocamo River
Ocamo River is a river of Venezuela. It is part of the Orinoco River basin. See also *List of rivers of Venezuela This is a list of rivers in Venezuela. By drainage basin This list is arranged by drainage basin, with respective tributaries indented under each larger stream's name. Atlantic Ocean Amazon River, Amazon Basin * ''Amazon River'' (Brazil) ** Rio ... References *Rand McNally, The New International Atlas, 1993. Rivers of Venezuela {{Venezuela-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peneplain
390px, Sketch of a hypothetical peneplain formation after an orogeny. In geomorphology and geology, a peneplain is a low-relief plain formed by protracted erosion. This is the definition in the broadest of terms, albeit with frequency the usage of peneplain is meant to imply the representation of a near-final (or penultimate) stage of fluvial erosion during times of extended tectonic stability. Peneplains are sometimes associated with the cycle of erosion theory of William Morris Davis, but Davis and other workers have also used the term in a purely descriptive manner without any theory or particular genesis attached. The existence of some peneplains, and peneplanation as a process in nature, is not without controversy, due to a lack of contemporary examples and uncertainty in identifying relic examples. By some definitions, peneplains grade down to a base level represented by sea level, yet in other definitions such a condition is ignored. Geomorphologist Karna Lidmar-Bergstrà ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amazon River
The Amazon River (, ; es, RÃo Amazonas, pt, Rio Amazonas) in South America is the largest river by discharge volume of water in the world, and the disputed longest river system in the world in comparison to the Nile. The headwaters of the ApurÃmac River on Nevado Mismi had been considered for nearly a century as the Amazon basin's most distant source, until a 2014 study found it to be the headwaters of the Mantaro River on the Cordillera Rumi Cruz in Peru. The Mantaro and ApurÃmac rivers join, and with other tributaries form the Ucayali River, which in turn meets the Marañón River upstream of Iquitos, Peru, forming what countries other than Brazil consider to be the main stem of the Amazon. Brazilians call this section the Solimões River above its confluence with the Rio Negro forming what Brazilians call the Amazon at the Meeting of Waters ( pt, Encontro das Ãguas) at Manaus, the largest city on the river. The Amazon River has an average discharge of about – ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Branco River
The Branco River ( pt, Rio Branco; Engl: ''White River'') is the principal affluent of the Rio Negro from the north. Basin The river drains the Guayanan Highlands moist forests ecoregion. It is enriched by many streams from the Tepui highlands which separate Venezuela and Guyana from Brazil. Its two upper main tributaries are the Uraricoera and the Takutu. The latter almost links its sources with those of the Essequibo; during floods headwaters of the Branco and those of the Essequibo are connected, allowing a level of exchange in the aquatic fauna (such as fish) between the two systems. The Branco flows nearly south, and finds its way into the Negro through several channels and a chain of lagoons similar to those of the latter river. It is long, up to its Uraricoera confluence. It has numerous islands, and, above its mouth, it is broken by a bad series of rapids. Water chemistry As suggested by its name, the Branco (literally "white" in Portuguese) has whitish water that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uraricoera River
The Uraricoera River (Uraricuera) is a river of Roraima state in northern Brazil. The confluence of the Uraricoera and Takutu Rivers forms the Branco River. Basin The river drains the Guayanan Highlands moist forests ecoregion. Part of the river's basin is in the Roraima National Forest. The Maracá Ecological Station was established by presidential decree on 2 June 1981. The station consists of the island of Maracá between the Santa Rosa and Maracá branches of the Uraricoera River in the municipality of Boa Vista, Roraima, with an area of . See also *List of rivers of Roraima List of rivers in Roraima (Brazilian State). The list is arranged by drainage basin, with respective tributaries indented under each larger stream's name and ordered from downstream to upstream. Roraima is located entirely within the Amazon Bas ... References Brazilian Ministry of Transport Rivers of Roraima {{Roraima-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caura River (Venezuela)
The Caura, is a tributary of the Orinoco River, located in BolÃvar State in Venezuela. Its flow is the second after the Caroni River among the affluents of the Orinoco River, with almost . The river is inhabited by both the Ye'kuana and Sanema indigenous groups. Basin The river drains the Guayanan Highlands moist forests ecoregion. The Caura River is about long. Its major tributary is the Erebato. Both rivers emerge from the Jaua- Sarisariñama Plateau, more than above sea level). The Caura is navigable up to Pará Falls (Salto Pará), an impressive waterfall formed by two branches of the river with an island in the middle Both branches have some rapids and join in one of the most remarkable waterfalls in the Orinoco basin, not because of its height, but because of the impressive flow of water. The Caura is a blackwater river, like the CaronÃ, the Ventuari River The Ventuari River is the largest tributary of the Orinoco in southern Venezuela. The Ventuari flows from sout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paragua River
The Paragua River is a river of Venezuela. It is part of the Orinoco River basin. It is the largest tributary of the Caronà River. The river drains the Guayanan Highlands moist forests ecoregion. See also *List of rivers of Venezuela This is a list of rivers in Venezuela. By drainage basin This list is arranged by drainage basin, with respective tributaries indented under each larger stream's name. Atlantic Ocean Amazon Basin * ''Amazon River'' (Brazil) ** Rio Negro *** Cas ... References *Rand McNally, The New International Atlas, 1993. Rivers of Venezuela {{Venezuela-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caronà River
The Caronà River is the second most important river of Venezuela, the second in flow, and one of the longest, from the Kukenan tepui through to its confluence with the Orinoco River. The name "CaronÃ" is applied starting from the confluence of the Kukenan with the Yuruanà River at from the source of the Kukenan and from its discharge in the Orinoco. The confluence takes place in Bolivar State. Hydraulic regime The Caronà is one of the rivers with the highest discharge rates in the world, with respect to the area of its basin. The average discharge is , with variations caused by the wet/dry seasons. The average maximum discharge is , and the average minimum is . Among the historic extremes are . The Caronà supplies 15.5 percent of the discharge of the Orinoco river. One of the characteristics of the CaronÃ's water is the dark color, caused by the high amount of humic acids due to the incomplete decomposition of the phenol content of the vegetation. The Caronà t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ventuari River
The Ventuari River is the largest tributary of the Orinoco in southern Venezuela. The Ventuari flows from south-central Venezuela in the Guiana Highlands southwest into the Orinoco River. It is long and its major tributary is the Manapiare River. The river drains the Guayanan Highlands moist forests ecoregion. The Ventuari River is the largest clearwater tributary of the Orinoco. , 470 fish species were known from the river, including several endemics, and a few new species have been described from the river since then. References * Hitchcock, Charles B. ''La región Orinoco Ventuari''. Relato de la Expedición Phelps al Cerro YavÃ. Caracas: Ministerio de Educación Nacional, Imprenta El Compás, 1984 (Translated from an older English Edition: ''The Orinoco - Ventuari Region''. American Geographical Society, 1947). * Koch-Grünberg, Theodor. ''Vom Roraima zum Orinoco''. 1917. Reissued by Cambridge University Press Cambridge University Press is the university press of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orinoco
The Orinoco () is one of the longest rivers in South America at . Its drainage basin, sometimes known as the Orinoquia, covers , with 76.3 percent of it in Venezuela and the remainder in Colombia. It is the fourth largest river in the world by discharge volume of water. The Orinoco River and its tributaries are the major transportation system for eastern and interior Venezuela and the Llanos of Colombia. The environment and wildlife in the Orinoco's basin are extremely diverse. Etymology The river's name is derived from the Warao term for "a place to paddle", itself derived from the terms ''güiri'' (paddle) and ''noko'' (place) i.e. a navigable place. History The mouth of the Orinoco River at the Atlantic Ocean was documented by Christopher Columbus on 1 August 1498, during his third voyage. Its source at the Cerro Delgado–Chalbaud, in the Parima range, was not explored until 453 years later, in 1951. The source, near the Venezuelan–Brazilian border, at ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tepui
A tepui , or tepuy (), is a table-top mountain or mesa found in South America, especially in Venezuela and western Guyana. The word tepui means "house of the gods" in the native tongue of the Pemon, the indigenous people who inhabit the Gran Sabana. Tepuis tend to be found as isolated entities rather than in connected ranges, which makes them the host of a unique array of endemic plant and animal species. Some of the most outstanding tepuis are Auyantepui, Autana, Neblina, and Mount Roraima. They are typically composed of sheer blocks of Precambrian quartz arenite sandstone that rise abruptly from the jungle, giving rise to spectacular natural scenery. Auyantepui is the source of Angel Falls, the world's tallest waterfall. Morphology These table-top mountains are the remains of a large sandstone plateau that once covered the granite basement complex between the north border of the Amazon Basin and the Orinoco, between the Atlantic coast and the Rio Negro. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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